Dental chair.



No. 657,360. Patented Sept. 4, I900.

F. BITTER.

DENTAL CHAIR.

(Application filed June 17, 1898., (No Model.) 4 Shee'ls-Sheet l.

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mtal I Gwen m1 m: nbnms PETERS a.. mum-mm. WASMINGTDM, a. c.

No. 657,360. Patented Sept. 4, I900. F. BITTER.

DENTAL CHAIR.

Application fled June 17, 1893.) (No Model.) 4 Sheets-Sheet 2.

No. 657,350. Patented Sept. 4, i900.

F. BITTER. I

DENTAL CHAIR.

(Applies-flan filed Ju no 17, 1898.)

4 Sheets-Sh9'et a.

(No Model.)

Qwuz'wl'oz flan/i 191 War (Quiz/i4, attonw No. 657,360. Patented Sept. 4, I900. F. BITTER.

DENTAL CHAIR.

(Applicatiun filed June 17, 1898.)

(No Model.) 4 Shee&s$hee 4.

v x /////////X 20 I um\\\\\\\*w a section on line 5 5 of Fig. 1.

vation of a detail.

being shown in an elevated situation.

FRANKRlTTETt, on ooriEsiER, NEW YORK;

D'ENTA'L CHAIR.

srncrrrcn'rr'on forming art a Letters Patent m. 657,360, datedeptember 4, 1908.

Application filed June 17, 1898.

the invention, such as will enable others skilled in the art to which it pertains to make and use thesame.

The invention relates to dental chairs, and has for its object to provide such chairs with improved devices for adjusting, guiding, and sustainingmovable parts.

The invention consists in the construction hereinafter described and pointed out.

In the accompanying drawings, Figure 1 is Fig. 2 is a broken 3 is a section on line 4 4 of Fig. 3. Fig. 4. is

Fig. 5 is a section on line 6 6 of Fig. 4. Fig. 6 is a section on line 7 7 of Fig. 1. Fig. 7 is a broken ele- Fig. 8 is a vertical central section of the seat-frame and seat, the latter Fig.

I 9 is an elevation of a lever for raising a supstrain when the plunger has been raised to its upper limit, a rod 10 is attached to a block 10, held on the valve-stem by spring 8. The rod is provided at its upper end with a transverse piece 11, thatoverhangs the edge of the plunger-tube and extends into the path of the plunger-head. As the head approaches the upper end of its travel, it strikessaid piece with the effect to lift rod 10 and block 10 and overcome spring 8, so that the valve may open if the pumping be continued inadvertently or otherwise.

11 denotes a set-screw where- Serial No. 683,712. (No model.)

by to regulate the time of the automatic openingof the valve. It also determines the extent of the opening and is therefore a means of regulating the rate of the descent of the seat. These parts thus briefly described are not claimed herein, though they pertain to an operative claim embodying the invention. 1

12 denotes an arm, preferably integral with the pedestal-section 2, fixed to tank 3. 13 is a standard fixed to said arm. It has an inclination like that of the upper part of said pedestal-section. It is provided with bearing surfaces or ways 14,arranged in two pairs, the individual ways being inclined with respect to each other, as shown in Fig. 6.

15 denotes two wheel-carrying arms pendent from the seat-frame cross-bar 16', which is provided with an extension 16, that supports said arms and furnishes a bearing for the upper end of the plunger-rod, as shown in Fig. 1. The arms 15 have inclined slots 17, within which wheels 18 have each its bearings. 19 denotes screws connecting the arms and adapted to hold the wheels on the ways 14. When the seat is raised or lowered by the plunger, the wheels run upon the tracks. The construction is particularly well adapted to guide the seat-frame without lateral vibration and without binding or excessive friction. The attachment of the guiding-arms directly to the seat-frame contributes to this result, and particularly since the arms are connected to the frame at points considerably removed from each other. The inclination of the standard and its tracks also adds materially to the smooth and steady action, since the movable parts rest upon their tracks or ways by gravity and have therefore less tendency to wabble than if the ways were vertically disposed.

Since the guiding devices are situated outside the pedestal, its upper part can be made with a comparatively-small diameter, andas the guide is behind the pedestal the sides and front of the seat-support are'made narrower than otherwise practicable and'lnore room is afforded for an operators limbs. At the rear the backward inclination of the chairback results in its overhanging the guide and standard and the supporting-arms, and these parts are therefore out of the operators way at that region. It will be understood that UNITED STATES PATENT GFFICE.

5 cally-adjustable post 22.

[ when frame 21 is in its lowest situation.

to the back and the mainifoot-rest. inpnioi constructions having vertical ly, -:adj=usta1bl 25 in connection .with a selativelyesmall uqgihol to a childs foot-rest .for using :the same n 0 To the supplemental seatfraine arefixed? 5o ispreferably journal-led in the iextension-28.

5'5 a'd'apted to receive the said rest.

60 rods 3,5depend. The rods are secured shy 65 138,1which supports the upholstered hinged with a holding-pawl 39 120 hold said back un the pedestal, together with all partssupported byit, rotatessupon the base 2O denotes the main seat-frame, and 21 a supplementary frameprovided with a verti- The post is held andguided laterally by asleeve 23,1ixed in the main seat-frame.

is an intermediate frame, preferably of wood, to fill the space between the flames ""and an interposed frame combined, as shown and described, whereby ans-upholstered "seat:

' r5. of a size suitable when elevated for a childs" 20 frame provides dimensions for the 86313588 a whole suitable for an adult both with-respect seats no provision has heretofore :been made Y ste-red seat suitablydisposed to the ibacksan' connection "with frames adapted to. vintuallygg enlarge'the seat for-the use of adults.

dren and is .madeventically-adj ustahletoaeni :a-blea child ;to be supported-with itsiheadrait ii the level ofzthe head-rest. it extends -nearrwardly to the upholste1'ed back, so ethat the i' 3 5 latter can be used with the elevated supple- 3 mental seat. A fotxterest is provided jn'ftheh plane .of the main seateframe, and therefore adapted to support :a childs limbs clear 40f said frame.-

it if lugs 24, which pivot-ally support :a lever 25, having a curved iflange 2.6, adapted to mung upon aro'ller 27, journa-led in anKemt i- 28 oft-the post-guiding sIee-veeor socketi 23. 29 i 45 denotes a recess formed in the lower end of? the flan ge to receive the solder when the letter has been swung to the frontand the seat 1210- vated, as indicated (in Fig. 1. The sleeve'23 is fixed to the main-seatrframe, andthero'ller An a-ntifrictionebearin g to rithe lever is-preferred, and a roller is rce-niveni en:tly:employed.

30ide-notes thechild s fo.ot-rest,and 31 aspa'ce J between ithevmai-n seat-firameand its-support,

:operative and.inoperative situations .gare indicated I 35 denotes vertically-adj-usta ble arm-rests i supported :bybosses'35", f rem-which extensionhand-screws'.

36 denotes extension-sof the mainseatframe 38, whichsupports itheiback eframezbymeaas of at rnnnionsz3z7 'Theframe has an extcnsien "back, providedwitha-rack,avhichcoeperates;

40 denotes the handle of an eccentric, the whole constitutinga lever having its fulcrum at 4'1 and adapted '-tov bear upon and move downwardly a rod 42 into engagement with ionc pfthe sockets 43 in the curvedface of block or rack-bar 4:4. The eccentric bearingface is so situated that when the handle 40 apnma hess ve t al line the see 42 is r tobe lifted a short distance by the spring i. Whenthe handle Zis moved to an approximately-horizontal position, the rod is'forced down by the eccentric and zengagesfone-iof the holes A3 in .rack .44, so that the rod pre merits the backeframe 38":fr.om rtunning nearswardlwiabouat EUhJBFit'EJJ-D'HiOHS E37. The eccem mess" so iormed'and related 3110113116 hackovedqdcwin to. cause iatssngagement with the rack -it shears vupon said extension 38 and descends :itj-against flanges 38 ef the'hack frame and holds the frame and its extension nfixed relation. Bywthis construction any desired inclination .canbeigisten ,:t0 the 1 back, an it can ":be.;lockedinsuch i-iposition by the means which locks itheextensionr o The supplementalseatisdesigned fonchi-l- Muscat-frame and the :pants rca'rried'iby it can be tilted Ion-thercrossfbarliiandadjusted to diiferent planes and can locked by means orarack-bar A56, iengaged byaispringheld pawl .47, whichican be disengaged bythe ztreadgleslever A8, which ,ihasla fulcrum @419 in animated to "the :block 44, which is afixed :tothe seatr'frame. v 1 r i 'IIaiving described myinvention, 1 claim-- 1. In a denatail chair, the main seat-frame, 'thetsmal'ler su pplemerrtal seat-(frame. with up- '--helstered seat, "the intermediate fnanresupported upon the main frame to fill'zthegspace between-5142110 ilargesand small seat-framesland support :the latter, devices for iele Mating the supplemental seat-frame and seat, above the intermediate frame and means sfor supportg itu'n an elevated situation whereby the a r insed'forra'childiorfor an adult. a

72. .rIn a dental chair, the main ,seatframe,

supplemental seat-frame and seat, edewices afor ieievafl'tmg the supplemental seat- 'frame and seat, means for supporting them in elevated situation, .said devicescomzprisin'g a lever loosely connected :to ithesup {plemental frame and supported to :mono in {contact with a part of the main "frame, and saidzpart.

"lsl'ga :dental chair, the main seat-frame, eth'e isupplementai I seat .-frame and seat, de- :vices ifor-elemting the supplemental. seatfimme and seat, :mean-sforsuppo-rting "it inan firmer 1leoseiy:comnected the supplemental ire-me mndsnpported to nun-p11 roller supby the mainseatframe, theileverhav lstered seat can {be .cou .veniently elevated situation, said de vices lco m-prisi-ng a,

wfwsune extension ":38 ithartkwhen the ,rod. is

f L l ing a recess to receive the roller whereby it is held stationary, and the roller.

4. In a dental chair, the main seat-frame,

a supplemental vertically-adjustable seat frame and seat, and an extensible foot-rest, said main seat-frame having a recess to re ceive the rest when retracted and the walls of the recess adapted to support the rest when extended to an operative situation.

5. In a dental chair, a pedestal, a seatframe, devices for raising and lowering the frame, rearwardly and downwardly inclined armsbearing ona partv fixed to the'pedestal to guide and steady the seat, said part, an

adjustable back-frame having trunnions supported in the seat-frame, a rack 46 connected to the seat-frame, a holding-pawl pivotally connected to a rearwardly and downwardly inclined arm, a plunger, and means foroperating the plunger, all substantially as set forth whereby the seat-frame and parts supported by it may be tilted and supported in 7 tension in the same operation.

In testimony whereof I have signed this specification in the presence of two subscribing witnesses.

FRANK RITlERi Witnesses:

J OHN H. OHADsEY, WILLIAM F. LYNN, 

